I've got my external content type and BCS all sorted and working - the list view of the external list shows 100% in the site and the external content type shows under my BCS service application.
Now I want to create a connection to this in my user profile synchronisation in order to map some additional info from this list to my user profiles (if possible using the email field as the 1-on-1 identifier). As soon as I try to do this I either get "External Content Types are not available" if I try to see what ECTs are available when adding the new synchronisation connection or the drop down for "Return items identified by this profile property" is empty if I manually enter the ECT name (and when I do the latter it finds the ECT)
Any ideas as to what I'm doing wrong?